Method for controlling lower limit of state-of-charge of power battery, computer readable storage medium, and vehicle

Abstract

A method for controlling a lower limit of a state-of-charge state of a power battery, and a vehicle are provided, the method includes: detecting, by a detection unit, a minimum ambient temperature and a minimum power battery temperature in at least one time period; evaluating, by an evaluation unit, a minimum power battery temperature in a preset time period after the at least one time period according to the minimum ambient temperature and the minimum power battery temperature in the at least one time period; determining, by a processing unit, a minimum state-of-charge value that meets a start-up power requirement of a vehicle engine at the minimum power battery temperature in the preset time period, and adjusting a lower limit value of the state-of-charge according to the minimum state-of-charge value, in order that the vehicle can be powered-up by a state-of-charge value of the power battery at low temperature environment.

1 . A method for controlling a lower limit of a state-of-charge of a power battery, the method comprising:
 detecting a minimum ambient temperature and a minimum power battery temperature in at least one time period;   evaluating a minimum power battery temperature in a preset time period after the at least one time period according to the minimum ambient temperature and the minimum power battery temperature in the at least one time period;   determining a minimum state-of-charge value of the power battery that meets a start-up power requirement of a vehicle engine at the minimum power battery temperature in the preset time period; and   adjusting a lower limit value of the state-of-charge of the power battery according to the minimum state-of-charge value of the power battery.   
     
     
         2 . The method-according to  claim 1 , wherein the minimum ambient temperature and the minimum power battery temperature in the at least one time period only comprise a minimum ambient temperature and a minimum power battery temperature in a first time period, evaluating the minimum power battery temperature in the preset time period after the at least one time period according to the minimum ambient temperature and the minimum power battery temperature in the at least one time period comprises:
 determining the minimum power battery temperature in the preset time period according to the minimum power battery temperature, a temperature constant and a first power battery temperature evaluation factor in the first time period.   
     
     
         3 . The method according to  claim 1 , wherein the minimum ambient temperature and the minimum power battery temperature in the at least one time period comprise a minimum ambient temperature and a minimum power battery temperature in a first time period and a minimum ambient temperature and a minimum power battery temperature in a second time period, the second time period is subsequent to the first time period, the evaluating the minimum power battery temperature in the preset time period after the at least one time period according to the minimum ambient temperature and the minimum power battery temperature in the at least one time period comprises:
 evaluating the minimum power battery temperature in the preset time period as the minimum power battery temperature in the first time period, when determining that the minimum ambient temperature in the first time period is lower than or equal to the minimum ambient temperature in the second time period, and the minimum power battery temperature in the first time period is lower than or equal to the minimum power battery temperature in the second time period; or   evaluating the minimum power battery temperature in the preset time period as the minimum power battery temperature in the second time period, when determining that the minimum ambient temperature in the first time period is lower than or equal to the minimum ambient temperature in the second time period, and the minimum power battery temperature in the first time period is higher than the minimum power battery temperature in the second time period.   
     
     
         4 . The method according to  claim 1 , wherein the minimum ambient temperature and the minimum power battery temperature in the at least one time period comprises, a minimum ambient temperature and a minimum power battery temperature in a first time period and a minimum ambient temperature and a minimum power battery temperature in a second time period, the second time period is subsequent to the first time period, evaluating the minimum power battery temperature in the preset time period after the at least one time period according to the minimum ambient temperature and the minimum power battery temperature in the at least one time period comprises:
 determining the minimum power battery temperature in the preset time period according to the minimum power battery temperature in the first time period, the minimum power battery temperature in the second time period and a second power battery temperature evaluation factor when determining that the minimum ambient temperature in the first time period is higher than the minimum ambient temperature in the second time period, and the minimum power battery temperature in the first time period is higher than the minimum power battery temperature in the second time period; or   determining the minimum power battery temperature in the preset time period according to the minimum power battery temperature in the first time period, a temperature constant and a third power battery temperature evaluation factor when determining that the minimum ambient temperature in the first time period is higher than the minimum ambient temperature in the second time period, and the minimum power battery temperature in the first time period is lower than or equal to the minimum power battery temperature in the second time period.   
     
     
         5 . The method according to  claim 1 , wherein determining the minimum state-of-charge value that meets the start-up power requirement of the vehicle engine at the minimum power battery temperature in the preset time period comprises:
 substituting the minimum power battery temperature in the preset time period into a discharge power Map of the power battery to obtain the minimum state-of-charge value of the power battery.   
     
     
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         11 . A vehicle, comprising:
 a power battery controller for controlling a lower limit of a state-of-charge of a power battery, the power battery controller comprises: a detector, an evaluator and a processor, wherein;   the detector is configured to detect a minimum ambient temperature and a minimum power battery temperature in at least one time period;   the evaluator is configured to evaluate a minimum power battery temperature in a preset time period after the at least one time period according to the minimum ambient temperature and the minimum power battery temperature in the at least one time period;   the processor is configured to: determine a minimum state-of-charge value of the power battery that meets a start-up power requirement of a vehicle engine at the minimum power battery temperature in the preset time period, and adjust a lower limit value of the state-of-charge of the power battery according to the minimum state-of-charge value of the power battery.   
     
     
         12 . A non-transitory computer readable storage medium which stores an instruction that is executed to cause a power battery controller of a vehicle to implement method for controlling a lower limit of a state-of-charge of a power battery, the method comprising:
 detecting a minimum ambient temperature and a minimum power battery temperature in at least one time period;   evaluating a minimum power battery temperature in a preset time period after the at least one time period according to the minimum ambient temperature and the minimum power battery temperature in the at least one time period;   determining a minimum state-of-charge value of the power battery that meets a start-up power requirement of a vehicle engine at the minimum power battery temperature in the preset time period; and   adjusting a lower limit value of the state-of-charge of the power battery according to the minimum state-of-charge value of the power battery.   
     
     
         13 . The vehicle according to  claim 11 , wherein the minimum ambient temperature and the minimum power battery temperature in the at least one time period only comprises a minimum ambient temperature and a minimum power battery temperature in a first time period, and the evaluator is further configured to:
 determine the minimum power battery temperature in the preset time period according to the minimum power battery temperature, a temperature constant and a first power battery temperature evaluation factor in the first time period.   
     
     
         14 . The vehicle according to  claim 11 , wherein the minimum ambient temperature and the minimum power battery temperature in the at least one time period comprise a minimum ambient temperature and a minimum power battery temperature in a first time period and a minimum ambient temperature and a minimum power battery temperature in a second time period, the second time period is subsequent to the first time period, and the evaluator is further configured to:
 evaluate the minimum power battery temperature in the preset time period as the minimum power battery temperature in the first time period when determining that the minimum ambient temperature in the first time period is lower than or equal to the minimum ambient temperature in the second time period, and the minimum power battery temperature in the first time period is lower than or equal to the minimum power battery temperature in the second time period; or   evaluate the minimum power battery temperature in the preset time period as the minimum power battery temperature in the second time period when determining that the minimum ambient temperature in the first time period is lower than or equal to the minimum ambient temperature in the second time period, and the minimum power battery temperature in the first time period is higher than the minimum power battery temperature in the second time period.   
     
     
         15 . The vehicle according to  claim 11 , wherein the minimum ambient temperature and the minimum power battery temperature in the at least one time period comprise a minimum ambient temperature and a minimum power battery temperature in a first time period and a minimum ambient temperature and a minimum power battery temperature in a second time period, the second time period is subsequent to the first time period, and the evaluator is further configured to:
 determine the minimum power battery temperature in the preset time period according to the minimum power battery temperature in the first time period, the minimum power battery temperature in the second time period and a second power battery temperature evaluation factor when determining that the minimum ambient temperature in the first time period is higher than the minimum ambient temperature in the second time period, and the minimum power battery temperature in the first time period is higher than the minimum power battery temperature in the second time period; or   determine the minimum power battery temperature in the preset time period according to the minimum power battery temperature in the first time period, a temperature constant and a third power battery temperature evaluation factor when determining that the minimum ambient temperature in the first time period is higher than the minimum ambient temperature in the second time period, and the minimum power battery temperature in the first time period is lower than or equal to the minimum power battery temperature in the second time period.   
     
     
         16 . The vehicle according to  claim 11 , wherein the processor is configured to: substitute the minimum power battery temperature in the preset time period into a discharge power Map of the power battery to obtain the minimum state-of-charge value of the power battery.